package cn.wolfcode.service.impl;

import cn.wolfcode.domain.Department;
import cn.wolfcode.mapper.DepartmentMapper;
import cn.wolfcode.qo.PageResult;
import cn.wolfcode.qo.QueryObject;
import cn.wolfcode.service.IDepartmentService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import java.util.Collections;
import java.util.List;

@Service
@Transactional
public class DepartmentServiceImpl implements IDepartmentService {

    @Autowired
    private DepartmentMapper departmentMapper;

    @Override
    public void delete(Long id) {

        departmentMapper.deleteByPrimaryKey(id);

    }

    @Override
    public void save(Department department) {

        departmentMapper.insert(department);
    }

    @Override
    public Department get(Long id) {


        return departmentMapper.selectByPrimaryKey(id);
    }

    @Override
    public List<Department> listALL() {

        return departmentMapper.selectAll();
    }

    @Override
    public void update(Department department) {

        departmentMapper.updateByPrimaryKey(department);
    }

    @Override
    public PageResult<Department> query(QueryObject qo) {

        int count = departmentMapper.selectForCount(qo);
        if (count == 0){

            return new PageResult<>(qo.getCurrentPage(),qo.getPageSize() , Collections.emptyList(), count);

        }

        //获取总页数
        int totalPage = count % qo.getPageSize() == 0
                ? count / qo.getPageSize() : count / qo.getPageSize() + 1;
        //判断当前页是否大于总页数,如果是,把总页数作为当前页来查询分页结果集

        if (qo.getCurrentPage() > totalPage){

            qo.setCurrentPage(totalPage);
        }
        List<Department> departments = departmentMapper.selectForList(qo);

        return new PageResult<>(qo.getCurrentPage(), qo.getPageSize(), departments, count);

    }
}
